{"problem":{"name":"均值","description":{"content":"给出一组样本数据，计算其均值。","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":131072},"difficulty":{"LuoguStyle":"P1"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB2055"},"statements":[{"statement_type":"Markdown","content":"给出一组样本数据，计算其均值。\n\n## Input\n\n输入有两行，第一行包含一个整数，表示样本容量 $n$。  \n第二行包含 $n$ 个浮点数 $a_i$，代表各个样本数据。\n\n## Output\n\n输出一行，包含一个浮点数，表示均值。\n\n选手输出与标准输出的相对误差或绝对误差不超过 $10^{-3}$ 即视为正确。\n\n[samples]\n\n## Note\n\n### 数据规模与约定\n\n对于全部的测试点，保证 $1 \\leq n \\leq 100$，$|a_i| \\leq 10^4$。","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2055","tags":["Special Judge","循环结构"],"sample_group":[["2\n1.0 3.0","2.0000"]],"created_at":"2026-03-03 11:09:25"}}